swift-guide.rst

Swift- Object storage service

Overview

Kolla can deploy a full working Swift setup in either a all-in-one or multinode setup.

Disks with a partition table (recommended)

Swift requires block devices to be available for storage. To prepare a disk for use as a Swift storage device, a special partition name and filesystem label need to be added.

The following should be done on each storage node, the example is shown for three disks:

Warning

ALL DATA ON DISK will be LOST!

index=0
for d in sdc sdd sde; do
    parted /dev/${d} -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
    sudo mkfs.xfs -f -L d${index} /dev/${d}1
    (( index++ ))
done

For evaluation, loopback devices can be used in lieu of real disks:

index=0
for d in sdc sdd sde; do
    free_device=$(losetup -f)
    fallocate -l 1G /tmp/$d
    losetup $free_device /tmp/$d
    parted $free_device -s -- mklabel gpt mkpart KOLLA_SWIFT_DATA 1 -1
    sudo mkfs.xfs -f -L d${index} ${free_device}p1
    (( index++ ))
done

Disks without a partition table

Kolla also supports unpartitioned disk (filesystem on /dev/sdc instead of /dev/sdc1) detection purely based on filesystem label. This is generally not a recommended practice but can be helpful for Kolla to take over Swift deployment already using disk like this.

Given hard disks with labels swd1, swd2, swd3, use the following settings in ansible/roles/swift/defaults/main.yml.

swift_devices_match_mode: "prefix"
swift_devices_name: "swd"

Rings

Before running Swift we need to generate rings, which are binary compressed files that at a high level let the various Swift services know where data is in the cluster. We hope to automate this process in a future release.

The following example commands should be run from the operator node to generate rings for a demo setup. The commands work with disks with partition table example listed above. Please modify accordingly if your setup is different.

Prepare for Rings generating

To prepare for Swift Rings generating, run the following commands to initialize the environment variable and create /etc/kolla/config/swift directory:

STORAGE_NODES=(192.168.0.2 192.168.0.3 192.168.0.4)
KOLLA_SWIFT_BASE_IMAGE="kolla/oraclelinux-source-swift-base:4.0.0"
mkdir -p /etc/kolla/config/swift

Generate Object Ring

To generate Swift object ring, run the following commands:

docker run \
  --rm \
  -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
  $KOLLA_SWIFT_BASE_IMAGE \
  swift-ring-builder \
    /etc/kolla/config/swift/object.builder create 10 3 1

for node in ${STORAGE_NODES[@]}; do
    for i in {0..2}; do
      docker run \
        --rm \
        -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
        $KOLLA_SWIFT_BASE_IMAGE \
        swift-ring-builder \
          /etc/kolla/config/swift/object.builder add r1z1-${node}:6000/d${i} 1;
    done
done

Generate Account Ring

To generate Swift account ring, run the following commands:

docker run \
  --rm \
  -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
  $KOLLA_SWIFT_BASE_IMAGE \
  swift-ring-builder \
    /etc/kolla/config/swift/account.builder create 10 3 1

for node in ${STORAGE_NODES[@]}; do
    for i in {0..2}; do
      docker run \
        --rm \
        -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
        $KOLLA_SWIFT_BASE_IMAGE \
        swift-ring-builder \
          /etc/kolla/config/swift/account.builder add r1z1-${node}:6001/d${i} 1;
    done
done

Generate Container Ring

To generate Swift container ring, run the following commands:

docker run \
  --rm \
  -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
  $KOLLA_SWIFT_BASE_IMAGE \
  swift-ring-builder \
    /etc/kolla/config/swift/container.builder create 10 3 1

for node in ${STORAGE_NODES[@]}; do
    for i in {0..2}; do
      docker run \
        --rm \
        -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
        $KOLLA_SWIFT_BASE_IMAGE \
        swift-ring-builder \
          /etc/kolla/config/swift/container.builder add r1z1-${node}:6002/d${i} 1;
    done
done

for ring in object account container; do
  docker run \
    --rm \
    -v /etc/kolla/config/swift/:/etc/kolla/config/swift/ \
    $KOLLA_SWIFT_BASE_IMAGE \
    swift-ring-builder \
      /etc/kolla/config/swift/${ring}.builder rebalance;
done

For more information, see the Swift documentation.

Deploying

Enable Swift in /etc/kolla/globals.yml:

enable_swift : "yes"

Once the rings are in place, deploying Swift is the same as any other Kolla Ansible service:

# kolla-ansible deploy -i <path/to/inventory-file>

Verification

A very basic smoke test:

$ openstack container create mycontainer

+---------------------------------------+--------------+------------------------------------+
| account                               | container    | x-trans-id                         |
+---------------------------------------+--------------+------------------------------------+
| AUTH_7b938156dba44de7891f311c751f91d8 | mycontainer  | txb7f05fa81f244117ac1b7-005a0e7803 |
+---------------------------------------+--------------+------------------------------------+

$ openstack object create mycontainer README.rst

+---------------+--------------+----------------------------------+
| object        | container    | etag                             |
+---------------+--------------+----------------------------------+
| README.rst    | mycontainer  | 2634ecee0b9a52ba403a503cc7d8e988 |
+---------------+--------------+----------------------------------+

$ openstack container show mycontainer

+--------------+---------------------------------------+
| Field        | Value                                 |
+--------------+---------------------------------------+
| account      | AUTH_7b938156dba44de7891f311c751f91d8 |
| bytes_used   | 6684                                  |
| container    | mycontainer                           |
| object_count | 1                                     |
+--------------+---------------------------------------+

$ openstack object store account show

+------------+---------------------------------------+
| Field      | Value                                 |
+------------+---------------------------------------+
| Account    | AUTH_7b938156dba44de7891f311c751f91d8 |
| Bytes      | 6684                                  |
| Containers | 1                                     |
| Objects    | 1                                     |
+------------+---------------------------------------+